Polyoxyalkylene-alkyl functional siloxane resins and aqueous compositions thereof

Abstract

Siloxane resins containing both polyoxyalkylene M siloxy units and alkyl functional M and T siloxy units and aqueous compositions thereof are disclosed. The aqueous compositions contain dispersed particles stabilized by the siloxane resin, and are useful for the entrapment and delivery of various personal, household, and medical care actives.

1. An aqueous composition having dispersed particles wherein the dispersed particles have an average particle size of less than 10 micrometers and comprise a siloxane resin comprising at least 80 mole % of siloxy units having the formula
   (R 1   2 R′SiO 1/2 ) x (R″SiO 3/2 ) y , wherein 
 x and y have a value of 0.1 to 0.95, 
 R 1  is an alkyl or aryl group having from 1 to 8 carbon atoms, 
 R′ is a monovalent organic group containing polyoxyalkylene units, 
 R″ is a monovalent hydrocarbon group having 2 to 8 carbon atoms. 
 
     
     
       2. The composition of  claim 1  wherein the siloxane resin comprises the units:
   (R 1   3 SiO 1/2 ) a   (i) 
   (R 2   2 SiO 2/2 ) b   (ii) 
   (R 3 SiO 3/2 ) c ,  (iii) 
   (SiO 4/2 ) d ,  (iv) 
   (R 1   2 R′SiO 1/2 ) x  and  (v) 
   (R″SiO 3/2 ) y ,  (vi) 
 wherein 
 R 1 , R 2 , and R 3  are independently an alkyl group having from 1 to 8 carbon atoms, an aryl group, a carbinol group, or an amino group, 
 R′ is a monovalent polyoxyalkylene group, 
 R″ is a monovalent hydrocarbon group having 2 to 8 carbon atoms 
 a, b, c, and d have value of zero to 0.2, 
 x and y have a value of 0.1 to 0.95, 
 with the provisos that the value of x+y is equal to or greater than 0.80, and the value of a+b+c+d+x+y=1. 
 
     
     
       3. The composition of  claim 1  where R′ is a propyl group. 
     
     
       4. The composition of  claim 1  wherein R′ has the formula —R 4 O(C n H 2n O) z R 5 , wherein
 n is from 2 to 4 inclusive, z is greater than 4, 
 R 4  is a divalent hydrocarbon containing 2 to 8 carbon atoms, 
 R 5  is hydrogen, an acetyl group, or a monovalent hydrocarbon containing 1 to 8 carbons. 
 
     
     
       5. The composition of  claim 4  wherein
 n is 2, z is 4 to 24, 
 R 4  is propylene, 
 R 5  is hydrogen. 
 
     
     
       6. The aqueous composition of  claim 1  further comprising a water miscible volatile solvent. 
     
     
       7. The aqueous composition of  claim 6  where the solvent is an alcohol. 
     
     
       8. The aqueous composition of  claim 1  wherein the dispersed particles are vesicles. 
     
     
       9. The aqueous composition of  claim 8  wherein the vesicles further comprise a non-aqueous component. 
     
     
       10. A process for preparing an aqueous dispersion comprising
 I) mixing
 A) a siloxane resin comprising at least 80 mole % of siloxy units having the formula
   (R 1   2 R′SiO 1/2 ) x (R″SiO 3/2 ), wherein 
 x and y have a value of 0.1 to 0.95, 
 R 1  is an alkyl or aryl group having from 1 to 8 carbon atoms, 
 R′ is a monovalent organic group containing polyoxyalkylene units, 
 R″ is a monovalent hydrocarbon group having 2 to 8 carbon atoms 
 
 B) optionally, a water miscible volatile solvent, 
 C) optionally, an organic or silicone oil, with water to form an aqueous dispersion of the siloxane resin, 
 
 II) removing the water miscible volatile solvent from the aqueous dispersion. 
 
     
     
       11. The process of  claim 10  wherein C) a silicone or organic oil is included in the mixing of step I). 
     
     
       12. The process of  claim 11  wherein the silicone oil is a volatile methyl siloxane. 
     
     
       13. A process for making a vesicle composition comprising;
 I) mixing,
 A) a siloxane resin comprising at least 80 mole % of siloxy units having the formula
   (R 1   2 R′SiO 1/2 ) x (R′SiO 3/2 ) y , wherein 
 x and y have a value of 0.1 to 0.95, 
 R 1  is an alkyl or aryl group having from 1 to 8 carbon atoms, 
 R′ is a monovalent organic group containing polyoxyalkylene units, 
 R″ is a monovalent hydrocarbon group having 2 to 8 carbon atoms, 
 
 B) an optional a water miscible volatile solvent, 
 C) optionally, an organic or silicone oil, with water to form an aqueous dispersion of the siloxane resin, 
 
 II) removing the water miscible volatile solvent from the aqueous dispersion to form the vesicle composition. 
 
     
     
       14. The vesicle composition produced by the process of  claim 13 . 
     
     
       15. The aqueous composition of  claim 1  further comprising a personal, household, or healthcare active ingredient. 
     
     
       16. A personal, household, and healthcare composition comprising the aqueous composition of  claim 1 . 
     
     
       17. The vesicle composition of  claim 8  further comprising a personal, household, or healthcare active ingredient. 
     
     
       18. A personal, household, and healthcare composition comprising the vesicle composition of  claim 8 .